我们已经在铑催化的氧杂双环烯烃的不对称开环反应中证明了卤化物效应。通过使用卤化物和质子添加剂,脂肪胺的催化剂中毒效应被逆转,允许一定量的亲核试剂以高产率和 ee 反应。其次,通过简单地将铑催化剂上的卤化物配体从氯化物变为碘化物,使用芳香胺、丙二酸酯或羧酸盐亲核试剂的反应的反应性和对映选择性得到显着提高。第三,通过应用卤化物效应和更强制的反应条件,反应性较低的氧杂二环 [2.2.1] 底物反应生成合成有用的对映体富集的环己烯醇产物。
Rhodium-catalyzed asymmetric ring opening reaction of oxabenzonorbornadienes with amines using ZnI<sub>2</sub> as the activator
作者:Xin Xu、Jingchao Chen、Zhenxiu He、Yongyun Zhou、Baomin Fan
DOI:10.1039/c5ob02331a
日期:——
[Rh(COD)Cl]2 and (R,R)-BDPP was used as an effective catalyst for the asymmetric ring opening reaction of oxabenzonorbornadienes with various amines by employing ZnI2 as the activator. Under the optimized reaction conditions, high enantioselectivities with good yields could be obtained from a wide scope of oxabenzonorbornadienes and amines.
Iridium-catalyzed highly enantioselective ring opening reaction of oxabenzonorbornadienes with amines
作者:Yongyun Zhou、Zhiwu Lu、Baiqiu Han、Chaoyuan Zeng、Zhenhua Zhang、Baomin Fan
DOI:10.1016/j.tetasy.2015.10.017
日期:2015.12
The complex of [Ir(COD)Cl](2) and (R)-xylyl-phanephos was used as an effective catalyst for the asymmetric ring opening reaction of oxabenzonorbomadienes with various amines. Under the optimized reaction conditions, high enantioselectivities with moderate to good yields could be obtained from a wild scope of oxabenzonorbornadienes and amines. (C) 2015 Elsevier Ltd. All rights reserved.
Asymmetric ring opening reaction of oxabenzonorbornadienes with amines promoted by iridium/NMDPP complex
As an efficient catalyst, the [Ir(COD)CI](2)/NMDPP complex has been successfully applied to promote the asymmetric ring opening reaction of oxabenzonorbornadienes with various amines, which afforded the corresponding products in good yields (72-98%) with good enantioselectivities (80-90% ee). (C) 2014 Published by Elsevier Ltd.
Effects of Halide Ligands and Protic Additives on Enantioselectivity and Reactivity in Rhodium-Catalyzed Asymmetric Ring-Opening Reactions
作者:Mark Lautens、Keith Fagnou
DOI:10.1021/ja010262g
日期:2001.7.1
Rhodium-Catalyzed Asymmetric Ring Opening Reactions of Oxabicyclic Alkenes: Application of Halide Effects in the Development of a General Process
作者:Mark Lautens、Keith Fagnou、Dingqiao Yang
DOI:10.1021/ja034845x
日期:2003.12.1
effects in the rhodium-catalyzed asymmetric ringopening reaction of oxabicyclicalkenes. By employing halide and protic additives, the catalyst poisoning effect of aliphatic amines is reversed allowing the amount nucleophile to react in high yield and ee. Second, by simply changing the halide ligand on the rhodium catalyst from chloride to iodide, the reactivity and enantioselectivity of reactions employing
我们已经在铑催化的氧杂双环烯烃的不对称开环反应中证明了卤化物效应。通过使用卤化物和质子添加剂,脂肪胺的催化剂中毒效应被逆转,允许一定量的亲核试剂以高产率和 ee 反应。其次,通过简单地将铑催化剂上的卤化物配体从氯化物变为碘化物,使用芳香胺、丙二酸酯或羧酸盐亲核试剂的反应的反应性和对映选择性得到显着提高。第三,通过应用卤化物效应和更强制的反应条件,反应性较低的氧杂二环 [2.2.1] 底物反应生成合成有用的对映体富集的环己烯醇产物。